The abnormal impact of clock drift (referred to as "clock drift") is focused on the positioning accuracy of satellite navigation receivers. Through theoretical analysis and comparison with measured data, the mechanism by which the clock drift affects the positioning results through the pseudo-range error amplification mechanism is revealed, and it is pointed out that its influence in high-orbit satellite systems such as Geostationary Earth Orbit (GEO) and Inclined Geosynchronous Orbit (IGSO) is particularly significant. The time-varying characteristics of the clock drift are systematically analyzed and the influence by multiple factors such as temperature changes, crystal oscillator aging, environmental stress and satellite clock errors are demonstrated. At the same time, it is pointed out that the improper configuration of the clock drift correction parameters is the key factor leading to the increase of pseudo-range error and the decline of positioning accuracy. Through the optimization of clock drift modeling and correction methods, the reliability and accuracy of the positioning system can be effectively improved.